1214152Sed//===-- save_restore_regs.S - Implement save/restore* ---------------------===// 2214152Sed// 3214152Sed// The LLVM Compiler Infrastructure 4214152Sed// 5222656Sed// This file is dual licensed under the MIT and the University of Illinois Open 6222656Sed// Source Licenses. See LICENSE.TXT for details. 7214152Sed// 8214152Sed//===----------------------------------------------------------------------===// 9214152Sed 10214152Sed#include "../assembly.h" 11214152Sed 12214152Sed// 13214152Sed// When compiling C++ functions that need to handle thrown exceptions the 14214152Sed// compiler is required to save all registers and call __Unwind_SjLj_Register 15214152Sed// in the function prolog. But when compiling for thumb1, there are 16214152Sed// no instructions to access the floating point registers, so the 17214152Sed// compiler needs to add a call to the helper function _save_vfp_d8_d15_regs 18214152Sed// written in ARM to save the float registers. In the epilog, the compiler 19214152Sed// must also add a call to __restore_vfp_d8_d15_regs to restore those registers. 20214152Sed// 21214152Sed 22214152Sed .text 23214152Sed .syntax unified 24214152Sed 25214152Sed// 26214152Sed// Save registers d8-d15 onto stack 27214152Sed// 28214152Sed .align 2 29214152SedDEFINE_COMPILERRT_PRIVATE_FUNCTION(__save_vfp_d8_d15_regs) 30214152Sed vstmdb sp!, {d8-d15} // push registers d8-d15 onto stack 31214152Sed bx lr // return to prolog 32214152Sed 33214152Sed // tell linker it can break up file at label boundaries 34214152Sed .subsections_via_symbols 35214152Sed 36